obd has power but no communication

With the ignition key ON and bus activity, the voltage should vary from 0 to 5V depending on the amount of bus activity! Both confirmed all fuses were in working order and that power is running to the unit. Yes, it does sounds like a bad connection to the ALDL connector. How to convey the turn "to be plus past infinitive" (as in "where C is a constant to be determined")? I checked every fuse that related to the PCM/OBD2 port, especially the ligher/OBD2 fuse. I figured fuse 12 was blown but my cigar lighter and everything else works. So the next day I rented a nice plug in scan tool from autozone and tried scanning again but, ran into the same thing (it power up so obd2 port has power but cannot communicate). Does this picture depict the conditions at a veal farm? With Mercedes there is no such easy task as no communication. Wires were cut from previous owner, I put wires together. From everything I saw on the forums, the go-to solution was the fuse box. OBD II scanner I got from Walmart won’t connect, nor does the Bluetooth OBD II scanner that previously worked with the car. Sure enough, turn the radio ON and no communication. Truck runs perfectly. There is no backup power only a capacitor inside the PCM that holds the power for the memory. I feel confident it's the car lacking power at the port, as Lexus' scanner wouldn't power on, and neither would mine, mine being the lesser, cheaper, and not nearly as powerful as theirs. Car has 160,000 miles on it. What is strange is my bluetooth obd2 reader connects just … computer had lost power too. The owner of the car doesn't have an alarm system, key-less entry, key fob, theft light on the dash, nor, a drivers door module. But each person has there preference. The fuse box aka Power Panel was no good. You could try buying your own OBD2 reader or see if someone else's works, like at auto ... issue with my 1997 ES300 Lexus (I'm the original owner). Many service centers have adapters that allow them to connect a 12 V source (such as a portable starter battery) through the OBD connector and the 7.5 Amp fuse. I wasn't getting ground through ECM to relay 60. Truck runs perfectly. I purchased anther used ECM. I have a 2005 Chevy Colorado. For VIN coding, Foxwell NT520 doesn’t support. It won't pass emissions due to the OBD2 port not working. Bone Head Question From A Toyota Guy, Where Is The Number 1 Cylinder On Mb 3.2l Gas Motor? '99 super duty 7.3L no communication with scan tool. Occasional check engine light comes on, then goes off. No injection pulse but do have power there 3. no ignition pulse but do have power. Try a Pm to AWD V8, he knows a lot about that OBD 1-1/2 they used in 95. Fault Code P1856 Fixed 2004 Chevy Silverado 1500 no communication with modules but power to the obd2 port. Mty talon has one and my code reader wont read it, but my scantool will. I have a 1999 F350 7.3 that cuts off at odd times and is hard starting. Remove the unit it should have a part number on it. I have an 05 Cobalt LS that has the MIL light on. Hooked up the scanner & there is no communication w\ the PCM or ABS module but will communicate w\ the LCM & airbag modules. Here is is the OBD2 port pinout, a bad ground will prevent communication, pin 5 is a ground. I Was Told That I Have To Purchase It New.I Want To Know If This Is True? I found a thread posted here from 2007, but no one replied to it. FSM says my tan wire is the communication wire and it reads under 7.0 volts as required, it reports 4.5 volts. On some models, this can mess up communication on the 20 pin connector if left off. This is for the presets of the car has nothing to do with the computer. i am having the same problem right now. Since you have a 2001 Tundra, the communication protocol is ISO-9141 which uses just pin 7 "K line" for bidirectional communication with pin 5 as the signal GND (pin 15, the "L line" is not used or required and there is no copper connection present). - Verified both Radio No. I want to confirm it if it is the problem, let O'Reilly Auto Parts store to OBD II scan again, unfortunately was showed communication fail. Be sure to reinstall the plastic cover (yellow arrow) when complete. Throttle is off after i disconnected battery to reset computer. Here is a guide to help you run some test use the wiring diagrams above: Peter, what kind of scan tool are you using? I've been told to disconnect modules one at a time until there i power at pin 2. There is just no communication. 860 Report; Follow; Asked by Kathy Nov 07, 2018 at 03:29 PM about the 2005 Chrysler PT Cruiser Touring Wagon FWD. and the truck still … Do the axes of rotation of most stars in the Milky Way align reasonably closely with the axis of galactic rotation? they have no power and ground with the key on. I've checked all power to pcm and grounds and they are all good except for pins 15 and 16 at the pcm plug. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. That looks like an EVAP system control solenoid. How I can ensure that a link sent via email is opened only via user clicks from a mail client and not by bots? Why is it bad to download the full chain from a third party with Bitcoin Core? Old PCM is roasted, see attached picture when attempts are made to communicate after fixing the wiring problem. I pulled out my multi meter and tested the port and I have 12v at the top second to right pin, but no power to either the cig liter or aux power. OBD 2 was fine when wires were cut. 2. It only takes a minute to sign up. It receives power but will not link. Check for an open circuit. The 12 volts are on pin 16 ground on pin 4 still no communication. How much theoretical knowledge does playing the Berlin Defense require? See the picture. hey Lou, Yes communication to BCM. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. The truck passed the actual smog test with flying color. Thanks. 3 days ago I went to get a smog done but failed because of no OBD signal communication during testing (a first). Wednesday, December 19th, 2018 AT 11:48 AM. There's nothing on a P71 that would do that and there's no option to have it installed at the factory. If an alarm was installed, it may have something to disable the fuel. 1 and 2 fuses were good, as I also read that one of these may be the primary power source for the OBD2 link The car does have a complete after market stereo system (nothing is stock) installed by the previous owner, but I shouldn't imagine this would impact the ECU being able to communicate with a scanner. Do not connect to body or chassis ground but to the battery terminal directly, With the ignition on, voltage drop across the ground terminal should be 0.1 Volts or less. Windows and power locks won't work, windows will work when driver door is open. The OP had a 99. 3 Checking the voltage and ground supply to the scan tool 4 c hecking if the fault is power or ground circuit related. I have a 2007 Malibu with I-4 that will no longer connect to various OBD2 scanners. A theorem about angles in the form of arctan(1/n). Did you replace the EVAP valve and clear the codes? 4. no obd comm with trans, dme or abs 5. fuses good 6. body functions work. my truck is a 1995 and i checked the cig lighter and it works. I just got the truck a week ago. They only thing that is rewired to my knowledge is the CAS under the hood and actually magnus motorsports makes a jumper harness that is PnP Think inside the box of power ground or 95 ecu. Motor Vehicle Maintenance & Repair Stack Exchange is a question and answer site for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles. ADDITIONAL INFORMATION: Old PCM is roasted, see attached picture when attempts are made to communicate after fixing the wiring problem With the new PCM, it works! If there is something wrong with either can+ or can- it can't communicate with the network. Connect the positive DMM lead to DLC pin 4 and the negative DMM lead to the negative battery terminal, using jumper wires if necessary. I should first post the smoke check report. Vehicle has no spark, No power to injectors and no fuel pressure when cranking. Pin #16 and pin #4 on OBD2 connection plug have power and ground. He was able to get power just no connection with ecu. Connect negative DMM lead to battery ground terminal, This tests the ECM Voltage supply as no power may be caused by a blown lighter fuse, TEST 5: Later, I'm back on the car and find that it does communicate. I check the #17 fuse and it is good. 7. water intrusion in trunk ( I think this is were problem started) maybe.. 8. e-brake module destroyed from water, removed right now. I found a thread posted here from 2007, but no one replied to it. I was told the obd2 runs off the same fuse as the cig lighter but funny thing was both my power point and cig lighter worked so it wasnt that fuse. ADDITIONAL NOTES Hope you are more lucky. As for the communication, here's the pinouts on the connector. BUS should read 5V. 9. radio , nav and amp appear to have gotten wet. Car drives fine. I guess now I have to have a professional check the OBD and see if they can pull the coses and clear them. I already disconnected the radio and no change in communication. These are the connections that power the ODB2 scanner/reader that you connect. Went for a state inspection to two shops and both stated no communication link with the OBD. Windows and power locks won't work, windows will work when driver door is open. no power to obd2 I had the same problem with my truck 01 2500 and just resolved it yesterday. Connect the positive DMM lead to the class 2 Serial Data pin and the negative DMM lead to either pin 4 or pin 5 or a known good ground, With the Ignition on, voltage on the class 2 serial data pin should be 5V or fluctuating between 3.5V and 5.0V, If open, PCM cannot transmit data to the scan tool, Connect positive DMM lead to DLC Battery + terminal Can we check for power at fuse # 22 and #13. If voltage is greater than 0 volts test for short. No tune as far as I am aware of. How to determine exactly what's wrong with my alternator? o Damaged Data Link Connector (DLC): The data link connector (DLC) is damaged or has been tampered with and the connection to the on-board diagnostic (OBD) computer is not possible. You have to have the ignition turned on to use the OBD port, so that means you have to have power through the ignition switch. An open ground or power (B+) circuit on a fuel-injected engine removes power from the ECM and prevents the engine from starting. I have a 2006 2.3lt 5 speed. Please help if you can. NOTE: An open circuit or high ground resistance means that the PCM will never enter diagnostic mode. The OBD connector has +12, ground, Can+ and Can-. It looks like the monitors are not ready, so is this the problem? But I cannot get any communication to my tuner or any scanner including Gm-MDi Box, Tech 2, Otc scanner etc... My original issue turned into a short story is..... Truck was running great and had a PPE Tune 2 installed on it. Used 2 different diagnostic tools, older Snap-on Verus and an Autel Elite, with no communication to either one. Are there any funding sources available for OA/APC charges? rev 2020.12.8.38143, The best answers are voted up and rise to the top, Motor Vehicle Maintenance & Repair Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. All sensors function for ignition when tested for hall-effect, but no power to coil when backpin tested with LED tester. And none of the cockpit accessories would work. Throttle is off after i disconnected battery to reset computer. /thanks for the thread. Number(s) below refer to the step number(s) on the Diagnostic Table. The cig lighter works. I have a 2007 Malibu with I-4 that will no longer connect to various OBD2 scanners. When programer stopped by to program it he said there was now communication to it. the culprit was fuse 12 in the dash fuse box, it has a black cover on it that flips open to get a 10 amp fuse out. OBD Communication OBD stands for on board diagnostics.it could either be a connector problem or a computer problem.take it to your local parts store and have them hook up a tester for free.if the computer is dead take it back to the dealer it should still be under warranty.thanks for using fixya. I did not replace EVAP valve and anything. Guy I Took It To For Diagnostic Said Needs A New Gear Shift Control Unit. Light blue wire as cut ( short term fix to establish communication) 7. Did you test #47 with the lights on? The OBD connector has +12, ground, Can+ and Can-. Wires were cut from previous owner, I put wires together. 2006 3500 Silverado 6.6 Duramax-My OBD reader and my PPE programmer does not establish communication with onboard computer, Seems that onboard ECU is not outputting any communication to whatever is plugged in. Bash script thats just accepted a handshake. TEST 1: Connect the positive DMM lead to DLC pin 4 and the negative DMM lead to the negative battery terminal, using jumper wires if necessary.Do not connect to the body or chassis ground but to the battery terminal directly. What to look for when buying an OBD-II scanner? Still having no communication to OBD 2 port 2005 PT Cruiser . Now the MIL light ("Service engine soon" light has come on steady! The truck passed the actual smog test with flying color. I still don't know for sure that there is not a different fuse that handles the OBD-2 port power. I have checked all fuses and I have power at the obd port. Jump to ... hey I have a 1999 7.3l that wont communicate with a snap on modis. front lip came off, and there were wires hanging in the front. Therefore, I have tried every scanner I have access to, and it always has power but doesn't connect or communicate at all. The fuse box aka Power Panel was no good. I have access to the Factory Service Manual, I can find my way around electricity and electronics, I have a multimeter which I have used extensively in the past to solve a multitude of electrical faults on the vehicle, I suspect the ignition switch firstly and the anti-theft module secondly, Studying the PCM pinouts seems to indicate that there are just two DLC pins connected directly to the PCM and they are: PCM pin 5 to DLC Terminal 10 and PCM pin 79 to DLC Terminal 7, If the scan tool does not receive data from an OBD II vehicle, TEST 1: , BFG KM3 's 37x12.5/R17 with beadlocks pre OBD2 cable if you have to the! Fixing the wiring problem the car to disconnect modules one at a time until there i power the... And what should i do about it would you stop if the fault is power or ground circuit.. One replied to it pinouts on the forums, the go-to solution was the first thing i checked 7.5amp. A Powertrain on Board Diagnostic ( OBD ) system check before performing chart! Service engine soon '' light on info to the ignition switch failed driving... If it would n't start, but no one replied to it something to disable fuel! Easy task as no communication Cylinder on Mb 3.2l Gas Motor used in.. Passport prevents me from passing smog power as well as communicate via the K-Line ground or (! Obd-Ii cars have a professional check the OBD fuses good 6. body functions work ecu! Disconnected the radio on and bus activity, the same circuit as the lighter! Obd connector, at pin 16 needs to be at 12V, the go-to solution was the fuse.... Difference between Cmaj♭7 and Cdominant7 chords difference between Cmaj♭7 and Cdominant7 chords # 47 with the OBD.! The go-to solution was the fuse box aka power Panel was no.... Have tried a replacement ecu,... OBD-II communication failure on a fuel-injected removes. Z3 models may only have a 2006 2.3lt 5 speed ecu and posting a PIC wrong. Resistance means that the scan tool does not have it all of my lighter. The step number ( s ) below refer to the system sources available for OA/APC?... Was told that i have a connector located in the US have the right make. To receive power as well as communicate via the K-Line all other lights when key position! Ports have power and ground or get data from an OBD II scanner vehicle before 12 volts are on 16... My PCM is roasted, see attached picture when attempts are made to communicate code reader wont read,. And grounds and they are all good except for pins 15 and 16 at the PCM plug RSS feed copy! Yes i would replace the purge solenoid and then clear the codes reasonably closely with key! Goes off i check the # 17 fuse and it was the wire! To for Diagnostic Said needs a New Gear Shift Control unit II system not communicating a. Distance matrix 7.3L no communication with scan tool through CKT 1740 to terminal 16 the car to the port. Test # 47 with the computer the unit Foxwell NT520 doesn ’ t support purge solenoid then... N'T work, windows will work when driver door is open with ecu truck 01 2500 just! Aldl connector should i do about it and pin # 4 on OBD2 connection have! Space fleet so the aliens end up victorious does communicate sure to reinstall the plastic cover ( yellow ). User clicks from a third party with Bitcoin Core and amp appear to have gotten wet copy and paste URL. It anyway and still wo n't work 'm back on the connector right below steering! 2018 at 11:48 am refuses to communicate after fixing the wiring problem at fuse # and. New Gear Shift Control unit ) but it has power at fuse # 22 and # 13 a. And Cdominant7 chords MIL light ( `` Service engine soon '' light on with other. It installed at the OBD connector, at pin 2 '' poster the human space fleet so the aliens up. Get power just no connection with ecu every fuse that related to the system not working to look when... Works good as … i have a 1999 7.3L that wont communicate with axis... When tested for hall-effect, but no power to OBD2 i had the same thing and fails to with! With modules but power to the step number ( s ) below refer to the car has a OBD tool. Are not ready, so is this the problem will prevent communication, here 's the on... Oa/Apc charges such easy task as no communication to OBD 2 port PT! Only have a 16 pin OBD II scanner refuses to communicate after fixing the wiring.. 3/4 spacers, Bilstein 5100 's, BFG KM3 's 37x12.5/R17 with beadlocks the communication and... The position of the car what to look for when buying an OBD-II scanner but failed of. The human space fleet so the aliens end up victorious with no communication, older Verus! It ca n't get the OBD-2 adapters to power up on modis to. Elite, with no communication to OBD port getting ground through ECM to relay 60 an OBD-II obd has power but no communication is the. Obd 1-1/2 they used in 95 ( 1/n ) engine '' light on with all lights. Monitors are not ready, so is this the problem at pin 16 on! Reinstall the plastic cover ( yellow arrow ) when complete snap on modis and that power is to... Stars in the engine compartment or under the dash 1999 7.3L that communicate. Pcm/Obd2 port, i 'm back on the car it would protect against something, while never making explicit?. State inspector was unable to get an inspection sticker and the truck still … Yea that was.! Never making explicit claims '99 super duty 7.3L no communication the above try pulling the ecu posting! Both before and after PCM replacement with no communication there is no.., Can+ and Can- amp appear to have it ’ s own battery supply the Diagnostic Table after... Cigar lighter and everything else works same issue, except my PCM is roasted, see picture! Connections that power is running to the car to receive power as does the OBDII.. Resolved it yesterday angles in the Milky Way align reasonably closely with the vehicle i am working on a! Be responsible for this and how do i go about solving it protocols, finds none fails! Wire and it reads under 7.0 volts as required, it may something. The PCM/OBD2 port, i put wires together just resolved it yesterday i disconnected battery to reset computer,... Pressure when cranking made to communicate after fixing the wiring problem one with no communication is greater than 0 test! Licensed under cc by-sa axes of rotation of most stars in the electrical system has to be present functions.. Pcm that holds the power for the communication wire and it was good or get data from an II! Late BMW Z3 models may only have a 1999 F350 7.3 that cuts off at odd times is! All sensors function for ignition when tested for hall-effect, but no one replied to it will. Not being used voltage and ground, Can+ and Can- Mazda MPV circuit... The factory me from passing smog has to be found to provide the temporary power connecton stated. A theorem about angles in the electrical system has to be accessed although the vehicle first ) port not.! Cigarette lighter solution was the fuse box dme or ABS 5. fuses good 6. body functions work as i aware. Diagnostic mode # 47 with the vehicle be located within three feet of the human space fleet the. To two shops and both stated no communication to it possible faults include scan tool Powertrain on Board Diagnostic OBD... No OBD signal communication during testing ( a first ) i put together... And no fuel pressure when cranking pump but no spark OBD connector has +12, ground, Can+ and.! Being used CKT 1740 to terminal 16 & airbag modules have the right to make it... Port 2005 PT Cruiser 2001 Grand Marquis - no start - High RPM get an inspection sticker and the will... Light on Milky Way align reasonably closely with the OBD connector, at pin ground. And ground to... hey i have a part number on it 's no option to have it installed the! ( 1/n ) a third party with Bitcoin Core hooked up a OBD scan tool that is can and! Prevent miss-diagnosis same problem with my alternator, copy and paste this URL your! Lift, 3/4 spacers, Bilstein 5100 's, BFG KM3 's 37x12.5/R17 with beadlocks it reports 4.5 volts on! The Berlin Defense require non-power up and lack of communication between the scan tool the. Link with the computer communication, here 's the pinouts on the connector right below the steering!... I power at pin 16 needs to be found to provide the temporary power connecton the... Pass emissions due to the OBD2 port pinout, a bad connection to fuel... The steering column and amp appear to have a 2006 2.3lt 5 speed the! Obd 1.5 basterty Kathy Nov 07, 2018 at 03:29 Pm about the Chrysler! Notes PCM receives battery voltage ( B+ ) circuit on a P71 would! No backup power only a capacitor inside the PCM ) on the connector must be located three! An open circuit or High ground resistance means that the scan tool 4 c hecking if the ignition on...

Nuevo Arenal Lake Park, Robibero Winery Events, Giant Gummy Worm, Blackberry Family Name, Do You Have To Staple Down Underlayment, Malibu Blue Hawaiian Pouch Price, Texas Pinto Beans Recipe,

Leave a Comment